Ventilator



ing had to the accompanying drawings,

UNITED sTATEs PATENT oEEIoE.

GEORGE COLI-IOUN, OF PHILADELPHIA, PENNSYLVANIA.

VENTILATOR.

Specification of Letters Patent No.

To all whom it may concern:

Be it known that I, GEORGE CoLHoUN, of Philadephia, in the county of Philadelphia and State of Pennsylvania, have invented a new and useful Improvement in Ventilators for Railroad-Cars, &c.; and I do hereby declare that the following is a full, clear, and exact description of the same, reference beforming a part of this specification, in which- Figure 1, is a vertical longitudinal section of a car with my improvement applied to it. Fig. 2, is a front view of the same.

Similar letters of reference, in each of the several figures indicate correspondingparts.

Before stating my invention I will premise by saying that I am aware that cones have been used on top of a car for the purpose of ventilation, and that therefore I do not intend to cover any new principle by my patent.

The nature of my invention consists in the inner and outer receiving cones C, D, elbow pipe B, and flaring discharge pipe F, when the whole is constructed, arranged and combined in the manner hereinafter described.

The essential peculiarity of my invention lies in the arrangement of the outer cone so that its rear end extends to or beyond the discharge end of the elbow pipe, and its forward end a considerable distance forward of both the vertical part of the elbow and the mouth of the inner cone. And it is this peculiarity, in connection with the Haring discharge pipe, inner cone and elbow pipe that, as I have found by experiment, renders this character of ventilator useful and effective to the extent required. With my arrangement, an annular current of air in a concentrated or compacted state is conveyed to the discharge end of the elbow pipe and then discharged and expanded suddenly into the flaring discharge pipe. And at the same instant a solid current of air concentrated or compacted, is discharged through the elbow pipe and thus while a powerful suction is produced up through the elbowA pipe by the annular current, vthe effect of said current is accelerated by this central solid current and consequently a per- 26,967, dated January 31, 1860.

fect withdrawal of the vitiated air from the car insured, and room thus provided for pure fresh air to rush into the car through the crevices or doors and windows. By this combination and arrangement, the air, as the car moves along, is compressed or compacted all around the outside of the elevated elbow pipe and also within the inner cone, and then suddenly escapes through and outside of the mouth of the elbow pipe in such a manner as to produce a vacuum in the elbow pipe and a consequent rushing out of the vitiated air which the car contains. As soon as the vitiated air is removed, its place is supplied with fresh air through crevices, or the doors and windows.

To enable others, skilled in the art, to make and use my invention, I will proceed to describe its construction and operation.

A, represents a rail-road car.

B, is the elevated 'elbow pipe. It is let into the top of car so as to be capable of being revolved.

C, is a hollow truncated cone with its truncated end inserted into the rear of the elbow pipe at a point just in line with the discharge of the horizontal portion` of said pipe. The truncated end of this cone may, if desired, have a flaring mouth put on it, as illustrated by dotted llnes so as to extend to near the discharge end of the elbow pipe.

I), is the main outer cone, it incloses the cone C, and a greater portion of the elbow pipe, as represented. Its truncated end meets, about at the termination of the horizontal portion of the elbow pipe, a flaring discharge or mouth piece, E, as represented.V

From this description, it will be evident that as the car moves forward, a powerful suction will be produced up through the pipe by means of the inner and outer cones, and the vitiated air will be exhausted from the car and thus room provided for the entrance of pure fresh air through the door `and windows or crevices.

The pipe being set so as to revolve as usual, the ventilator answers both in going and returning with the train. With a very little change in the manner of applying my combination and arrangement and `providing it with a weather vane, it will answer a most excellent purpose for all places where ventilation or strong draft is required.

What I claim as my invention and desire The above specification of my improveto secure by Letters Patent, is ment in ventilators signed by me this 15th.

The inner and outer receiving cones C, D, day of November 1859. elbow pipe B, and flaring discharge pipe F, 5 when the Whole is constructed, arranged and Witnesses combined, substantially as and for the pur- GOODWIN Y. AT LEE, pose set forth. R. W. FENWIGK.

GEORGE COLHOUN. 

